TYPO3 Core

When ckeditor loads its resources, it adds a "timestamp" parameter to the url of the resource:
This timestamp changes with every version of ckeditor: with ckeditor 4.11.1 it is "?t=IE8A".

But this timestamp is not added for contentsCss.

I think this should be reported in upstream ckeditor.

Loading of contentsCss is done here: https://github.com/ckeditor/ckeditor-dev/blob/4.11.1/core/tools.js#L346 (timestamp not appended to CSS url)
Loading of other resources uses this: See https://github.com/ckeditor/ckeditor-dev/blob/4.11.1/core/ckeditor_base.js#L177 (timestamp appended to resource url)

This is still an issue in TYPO3 10.4.14!

I added some new CSS to an CSS file in contentsCss. The changes were not picked up from the BE editor.

After I cleared the browser cache the style was present in the BE.