run.sh only builds partial site because of $HUGO_THEME specification.

[simonszu]

I have a blog with 308 pages. I have noticed that the run.sh script only builds the site partially:

Building one time...

                   | EN
+------------------+----+
  Pages            | 33
  Paginator pages  |  0
  Non-page files   | 71
  Static files     |  1
  Processed images | 68
  Aliases          | 31
  Sitemaps         |  1
  Cleaned          |  0

Total in 675 ms
Sleeping for 60 seconds...

However, when i enter the container and execute the hugo command manually, all 308 pages are built:

$ docker exec -it hugo_app_1 /bin/sh                                                                                                                                                                 126 [10:14:34]
/src # /usr/local/sbin/hugo --source="/src" --destination="/output"

                   | EN
+------------------+-----+
  Pages            | 308
  Paginator pages  |  40
  Non-page files   |  71
  Static files     |   3
  Processed images |  68
  Aliases          |  32
  Sitemaps         |   1
  Cleaned          |   0

Total in 4202 ms

I have observed this behaviour after the update to 0.39, i think. If i remove the $HUGO_THEME argument from the build command, all pages are built by run.sh again. Why has the image specified $HUGO_THEME at all? This is usually configured in the hugo config file.