Address-list being unintentionally deleted

Hi there

I am facing a problem with the “address-list” feature, in Firewall menu.

This is perhaps a bug, which removes the inserted addresses from the address-list.

I noticed that this “phenomenon” happens only with large lists, with about 1000 or more addresses added.

The “phenomenon” could be verified in several equipment, using versions 6.39.3 (Bugfix) and 6.41 (Current).

Has anyone also gone through this?

This is one of the lists used.
https://lists.mikrotik.help/spamhaus.rsc