What i did / Steps to reproduce

add a marker and give it a label and a icon.
then update the same marker again without those (since they havent changed...)
marker is gone never shown but is still registered.
See image for clarification : https://prnt.sc/1qwcnw8

Expected result

Icon shows as it was just the location updated

Actual result

icon is gone...

Context

1.6.0 beta (api and plugin)

As discussed on discord, you were creating a new Marker, instead of updating it. Which means the actual result is the expected one.
So i am closing this issue :)