@Dusan_Krehel: Please always use the bug report form (linked from the top of the task creation page) to create a bug report, and fill in ALL sections in the template:

Steps to replicate the issue (include links if applicable):

What happens?:

What should have happened instead?:

• https://fa.wikipedia.org/w/api.php?action=query&list=users&ususers=Dušan_Kreheľ_(bot)&usprop=groups show that the account is member of "groups": [ "bot", "*", "user", "autoconfirmed"
• List of account contributions: https://fa.wikipedia.org/wiki/ویژه:مشارکت‌ها/Dušan_Kreheľ_(bot)
• Example edit: https://fa.wikipedia.org/w/api.php?action=query&prop=revisions&titles=آدام_فدریچی&rvlimit=2&rvprop=timestamp|user|comment
• Going to https://fa.wikipedia.org/wiki/ویژه:تغییرات_اخیر?userExpLevel=learner&hidebots=1&hidepreviousrevisions=1&hidenewpages=1&hidecategorization=1&hideWikibase=1&hidelog=1&limit=1000&days=3&urlversion=2 it lists numerous edits by this account, though hidebots=1:

The edits are not marked as bot according to the database. This means that the bot=1 flag on action=edit does not has an effect

MariaDB [fawiki_p]> select rc_bot, count(*) from recentchanges_userindex where rc_actor = 2552876 group by rc_bot;
+--------+----------+
| rc_bot | count(*) |
+--------+----------+
|      0 |     2123 |
+--------+----------+
1 row in set (0.008 sec)

According to the list of grants https://fa.wikipedia.org/wiki/Special:ListGrants?uselang=en the highvolume grant must be checked to allow the bot-password login to act as bot (and is allowed to mark edits as bot)

Please check Special:BotPassword for that.

You can use assert=bot to get error message, when the bot lost the bot user right

It would be good to update the documentation for the tag. The description of highvolume was not clear about the function of that parameter.

Feel free to file a dedicated Documentation ticket by following https://www.mediawiki.org/wiki/How_to_report_a_bug - thanks a lot! :)