Strange height of backquotes in SQL in PHP string literals

[f1amy]

The backquotes have different height on start and end of names:

Looks like it depends on the string inside the quotes:

[philippnurullin]

Hi @f1amy . Please send me the exact text with symbols. Looks like the problem is with grave (U+0060). And the placement of it is shifted because of OpenType Feature "Case Sensitive Forms".
What IDE you using?

[f1amy]

Hello, @philippnurullin.
Here is the file: backquotes.txt.
IDE is PHPStorm 2021.1 EAP.

[f1amy]

I realized that this could be due to EAP build I'm using, but I don't have any other installed currently.

[philippnurullin]

Yes, it may. We are exploring the ability to support OpenType Features.
We will investigate this issue. Thanks for the feedback.

[toothbrush7777777]

I see the same in the browser (Firefox / Microsoft Edge / Chrome) and Visual Studio Code (only tested on Windows).
This appears to happen when the preceding (Latin?) letter is capitalised.

SELECT `SQL`, `TestID`, `sql`, `testid`, `test_id` FROM `a`

[philippnurullin]

I have spotted the source of the problem. It's autogenerated OpenType feature.
Turned off for now.