When I click the icon in top-left (the planner icon) or press 'u' and then click/press it again the icon in top-left disappears and if other mods have icons there they can also disappears.

tested 3 cases:
1. helmod alone => disappears
2. helmod with bob adjustable inserters => stays
3. helmod with TSM => disappears

This wouldn't be that big of a problem when using only helmod since 'u' does the same thing as the icon but when using it with TSM it's impossible to access the TSM gui.

hello
if the icon at the top left disappears, another mod is deleting it.
but you can change the key in the control settings.
if you give me the list of your mods (or saved game) I could look at which one is problematic.

Tried it with only helmod on and it still disappeared. (Even tried it on another pc with fresh factorio install and only this mod.)

I confirm the bug. I use factorio lib but if helmod is the first, the top panel owner is helmod and i clean all when owner is helmod.
I didn't think I was the owner.
that will fix in next release

thanks

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fixed in v0.12.5