its me again
if you place the emiter and destroy it the lamp stays and you can't destroy the lamp so the space on the tile gets taken forever

here is the mod https://mods.factorio.com/mod/PoleLamps

This might be easier to fix on their end - either by having a blacklist of problematic entity names (eg. anything with "dummy" in the name shouldn't be considered a real power pole), or by checking whether the pole still exists (on the next tick or on interaction) and removing the lamp otherwise.

I could probably explicitly destroy the dummy before replacing it with the emitter (which should allow PoleLamps to notice the pole getting replaced), but I currently don't have time to test whether that causes any issues.

I just noticed that PoleLamps already has a blacklist configurable in the mod settings - putting stormwall-dummy in there should solve the issue.