Hi Andre,
I have tried to replicate the issue you described for closing p tag in my local enviornment but didn’t find that. If you are using a single paragraph and you have shift into the Rich Text option it will remove the p tag, otherwise it will not remove anything. If only the closing p tag has been removed, there might be some different reasons behind your issue. I would like to suggest troubleshooting the following common issue to help us to recognize the reason.
1.Theme Related Issue
2.Plugin Conflict
3.Theme Update related issue
4.Child Theme Related issue
5.CSS/JS Customization
6.Disabling Cache
7.Disabling CDN
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Thanks