Native Russian speaker, C1 English speaker, B2 Arabic speaker. If you notice me removing sections on Arabic verb conjugations and such, I edit Wiktionary from a smartphone with touchscreen with mobile Chrome, so I actually just copypaste my contributions as pre-typed texts from my notepad app rather than editing them in a browser window, it's just more convenient for me this way, hence why I may remove them undeliberately by entirely replacing a whole old text with a new one. Sorry about this inconvenience, just restore the removed sections if needed in such cases.