I assume you mean language overrides for email sending? The „email overrides“ in t he title of the is PR is misleading.

Anyway I think this can happen with any kind of language overrides for language strings which contain placeholders for parameters when the number of parameters changes in that string between Joomla versions. We have semantic versioning and maybe a b/c promise for that situation. But between 2 major versions 3 and 4 I would not expect it to be b/c. Major version changes should allow such changes in language strings. I would never expect that with a major version update language strings remain the same, and so I would expect changes and would know that I have to check my language overrides. That’s so clear that it does not need a postinstall message, a d as said is is not limited to the mail functions.

For these reasons I think this issue should be closed as expected behavior.

Many of my clients have had issues with codeMirror strings accepting different amount of values and would crash their upgraded site. Usually a proper language file update fixes those issues but I understand the frustration if this happen on language overrides manually created or in this case in email that are sent out. Since the email system was completely overhauled, although unfortunate, I would expect this behavior. Some users may not be as aware of these potential issues, and it's probably more an issue with providing the proper information to those who update their sites to Joomla 4.

Maybe the override changes system should be available for language strings as well?

@coolcat-creations Just plain NO. This would introduce (even bigger) mess in codebase.

@wojtekxtx please explain why. Its a good suggestion.

@brianteeman Because it will mean new (possibly untested = unsafe) code added, more maintanance burden, more (unexpected) things may/will happen. You never know.

Im minimalist; less code = better;

Thats just an excuse for never adding or changing anything. trolling again

@brianteeman no. Its sad reality. More code means more maintenance, more possible attack vectors, more ways ţo exploit code etc.

It's crazy that today world is as deceptive as it's but that's reality.

due to code changes the previously added overrides are either not in use or outdated. Changing the email text language string caused a not documented backwards break. It would be good to see if an override was changed or at least list somewhere such changes.

@coolcat-creations Im all for (auto)generating list of overrides (hence thumb up).
Im suprised that, in well-established project as Joomla, there is a room for thing like breaking backward compatibility and allowing newly added code to make other part(s) of code outdated. Or is it lack of maintainabiity?

do you even use joomla

@brianteeman his comment tells he don't

@coolcat-creations see #24952

So my issue is in fact a duplicate, and I close this and add a comment there. Thank you @brianteeman