Thanks for the quick answer and the .png! I have now found out that the “VisuStella Picture Common Events” plugin is responsible (as can be seen in the details in the screenshot). At least when I run it with your plugin. I've added the error message from the DevTool for you:
"FOSSIL.js:7898 FOSSIL is now running as main.
VM143:12 Static PreFixes are here
VM870:803 finalFixes Here
DevTools failed to load SourceMap: Could not load content for chrome-extension://njgcanhfjdabfmnlmpmdedalocpafnhl/js/libs/pixi.js.map: System error: net::ERR_FILE_NOT_FOUND
rmmz_managers.js:2036 SyntaxError: Unexpected token u in JSON at position 0
at JSON.parse (<anonymous>)
at Function.JsonEx.parse (rmmz_core.js:6445)
at Function.JsonEx.makeDeepCopy (rmmz_core.js:6455)
at Game_System.<computed> [as createPictureCommonEventData] (VisuMZ_4_PictureCmnEvts.js:1368)
at Game_System.<computed>.<computed> [as pictureCommonEventData] (VisuMZ_4_PictureCmnEvts.js:1368)
at Game_System.<computed> [as pictureCommonEvent] (VisuMZ_4_PictureCmnEvts.js:1368)
at Sprite_Cursor.Sprite_Picture.<computed>.<computed> [as isClickEnabled] (VisuMZ_4_PictureCmnEvts.js:1368)
at Sprite_Cursor.Sprite_Clickable.processTouch (rmmz_sprites.js:29)
at Sprite_Cursor.Sprite_Clickable.update (rmmz_sprites.js:25)
at Sprite_Cursor.Sprite_Picture.update (rmmz_sprites.js:2906)
SceneManager.catchNormalError @ rmmz_managers.js:2036
SceneManager.<computed> @ VisuMZ_0_CoreEngine.js:9423
SceneManager.update @ rmmz_managers.js:1945
Graphics._onTick @ rmmz_core.js:811
TickerListener.emit @ pixi.js:9093
Ticker.update @ pixi.js:9548
Ticker._tick @ pixi.js:9298
requestAnimationFrame (async)
Ticker._tick @ pixi.js:9301"
Can you please take a look at it, maybe you can find something out?