New styles not applied and old ones vanished

Yesterday, using the command Actions → Custom styles creator, I created a new, very simple style (it assigns the colour #0000FF to the text). I called the style Blue Text and the class BlueText. I saved and updated the template.
However, neither the style was recognised nor the class applied.
In addition, the saving procedure issued some messages.
So I restored the template to the previous version, but the warning messages remain and, more importantly, all my old styles have disappeared (there were about eight of them).
It seems that the old styles and classes that have disappeared are still usable, but I do not understand why they do not appear in Template Creator CK.
How do I get them to appear again in Template Creator CK?
And how do I create the new TestoBlu style?

Joomla! 3.10.11 + Template Creator CK 5.2.7 + PHP 8.0.24
www.claudioromeo.it

Hi
if you restored your template (Actions >> restore), you can not have the problem remained. Check that you restored the correct version
you can also send me your gabarit .tck3z so that I can check
CEd

I reverted to the most recent template.
All my old styles are present. Not the new one.
So I created it again, calling it Re (see image)

Saved and updated.
The Re style is not listed. The other ones are. (see image)

I will send you the gabarit.

I have imported your garbarit, I see the custom style "RE" and others
saved the template, still working
installed the template, setup as default, I go into an article >> editor css classes >> RE is listed
I use Tinymce

I don't think that the problem is the template, try to clear all your caches, also the browser cache

I will never learn!
I tried with TinyMCE, but Re was not available.
So I deleted the browser's cookies and suddenly everything worked fine.
I will never learn!
I will never learn!
I will never learn!
Thank you so much!

cookies and caches are a pain