diff --git a/eo-maven-plugin/src/main/java/org/eolang/maven/optimization/OptCached.java b/eo-maven-plugin/src/main/java/org/eolang/maven/optimization/OptCached.java
index c4835add9e..f808fbfc94 100644
--- a/eo-maven-plugin/src/main/java/org/eolang/maven/optimization/OptCached.java
+++ b/eo-maven-plugin/src/main/java/org/eolang/maven/optimization/OptCached.java
@@ -41,9 +41,12 @@
  * Returns already optimized XML if it's found in the cache.
  *
  * @since 0.28.11
- * @todo #2674:30min The function {@code  OptCached.contains(final XML xml)}
- *  isn't work properly. This function compares caching and compilation times,
- *  which may lead to erroneous results. We need to fix this.
+ * @todo #2746:30min Use checksum, not time.
+ *  The following tests show that fetching from the cache doesn't work correctly:
+ *  - {@link OptCachedTest#returnsFromCacheCorrectProgram(Path path)},
+ *  - {@link OptCachedTest#returnsFromCacheButTimesSaveAndExecuteDifferent(Path path)}.
+ *  Need to fix the file validation from cache: using checksum, but not time.
+ *  Don't forget to enable the tests.
  */
 public final class OptCached implements Optimization {
 
diff --git a/eo-maven-plugin/src/test/java/org/eolang/maven/optimization/OptCachedTest.java b/eo-maven-plugin/src/test/java/org/eolang/maven/optimization/OptCachedTest.java
index 17f684ad45..7098317237 100644
--- a/eo-maven-plugin/src/test/java/org/eolang/maven/optimization/OptCachedTest.java
+++ b/eo-maven-plugin/src/test/java/org/eolang/maven/optimization/OptCachedTest.java
@@ -63,7 +63,7 @@ void returnsFromCacheIfXmlAlreadyInCache(@TempDir final Path tmp) throws IOExcep
         final XML program = OptCachedTest.program(ZonedDateTime.now());
         OptCachedTest.save(tmp, program);
         MatcherAssert.assertThat(
-            "We expected that the program will be returned from the cache",
+            "We expected that the program will be returned from the cache.",
             new OptCached(
                 path -> {
                     throw new IllegalStateException("This code shouldn't be executed");
@@ -74,6 +74,41 @@ void returnsFromCacheIfXmlAlreadyInCache(@TempDir final Path tmp) throws IOExcep
         );
     }
 
+    @Disabled
+    @Test
+    void returnsFromCacheButTimesSaveAndExecuteDifferent(@TempDir final Path tmp)
+        throws IOException {
+        final XML program = OptCachedTest.program(ZonedDateTime.now().minusMinutes(2));
+        OptCachedTest.save(tmp, program);
+        MatcherAssert.assertThat(
+            "We expected that the not immediately saved program will be returned from the cache.",
+            new OptCached(
+                path -> {
+                    throw new IllegalStateException("This code shouldn't be executed");
+                },
+                tmp
+            ).apply(program),
+            Matchers.equalTo(program)
+        );
+    }
+
+    @Disabled
+    @Test
+    void returnsFromCacheCorrectProgram(@TempDir final Path tmp)
+        throws IOException {
+        final XML prev = OptCachedTest.program(ZonedDateTime.now(), "first program");
+        OptCachedTest.save(tmp, prev);
+        final XML current = OptCachedTest.program(ZonedDateTime.now(), "second program");
+        MatcherAssert.assertThat(
+            "Expecting current program to be compiled, but prev program was returned from cache.",
+            new OptCached(
+                path -> current,
+                tmp
+            ).apply(current),
+            Matchers.equalTo(current)
+        );
+    }
+
     @Test
     void optimizesIfXmlIsAbsentInCache(@TempDir final Path tmp) {
         final XML program = OptCachedTest.program();
@@ -148,12 +183,23 @@ private static XML program() {
      * @return XML representation of program.
      */
     private static XML program(final ZonedDateTime time) {
+        return OptCachedTest.program(time, "same");
+    }
+
+    /**
+     * Generates EO program for tests with specified time and context.
+     * @param time Time.
+     * @param something String.
+     * @return XML representation of program.
+     */
+    private static XML program(final ZonedDateTime time, final String something) {
         return new XMLDocument(
             new Xembler(
                 new Directives()
                     .add("program")
                     .attr("name", "main")
                     .attr("time", time.format(DateTimeFormatter.ISO_INSTANT))
+                    .attr("something", something)
                     .up()
             ).xmlQuietly()
         );