in winbox
when the lo interface be selected , the remove button was not available ,because the lo intface is system default ,it cant be removed
but
When I select both the lo interface and any other removable interface (bridge\gre-turnnel\pppoe-client\pptp-client) simultaneously, the remove button will be available!! ，and can remove them successfully at the same time!!

What's going on

If discovered in a timely manner, it can be restored by pressing the undo button
But if there are too many operations, it will be impossible to use the undo button
How to add the lo interface back at this point ，i love it,i dont want to lose it

Indeed the lo interface has been deleted this is nasty bug, to restore lo this is what i do

/system/reset-configuration no-defaults=yes

I recreate the same step as you mentioned and I press the undo button the removal of loopback interface wasn't reverted only the eoip interface that i create to reproduce the bug was reverted, good catch with the bug

Make sure to create a bug report with support or it probably never be fixed.

The issue is noted!

I recreate the same step as you mentioned and I press the undo button the removal of loopback interface wasn't reverted only the eoip interface that i create to reproduce the bug was reverted, good catch with the bug

press undo button twice or multiple times