In-Game: JSON parse error when using layer effects in 2024.600

[gm-bug-reporter]

Description

For some projects I have problem with using Layer Effects, it shows

ERROR!!! :: ############################################################################################
ERROR in action number 1
of Create Event for object <undefined>:
JSON parse error############################################################################################

before any line of GML code is executed

Steps To Reproduce

1. Create project
2. Open room, set "Underwater" filter.
3. Run game
4. Observe code error dialog

(smallest possible example project attached)

Which version of GameMaker are you reporting this issue for?

IDE v2024.600.0.562 Runtime v2024.600.0.582

Which operating system(s) are you seeing the problem on?

Windows 10.0.22631.0

Which platform(s) are you seeing the problem on?

Windows

ef25efdd-277a-43e4-94ce-b40f106d2e46

[gnysek]

This is my issue, but GM again lost info about my github authorization (thought I refreshed it 5 minutes ago).

Might be connected with #6050 .

[gnysek]

Also, when reporting a bug, I've got such window:

Seems that layer effects are prefabs now and that might be connected to this issue somehow.

[gnysek]

This might be casued by Locale settings, same as #5986 and #6058 . I still had it on runtime 2024.600.0.582 if that helps.

[DiasFranciscoA]

This is related with the locale settings fixed here:

#5986 and #6058

[mgeddesGM]

verified as of Beta IDE v2024.600.0.579 Runtime v2024.600.0.605