Thief, dodgeroll, infiltrator arrow
I can confirm that I too have encountered this bug as of recently. It occurs when trying to dodge immediately after using infiltrator’s arrow, but it does not happen every time. I too request that this be fixed.
It appears this bug is related to all port skills that have no channel time, including mesmer, ele and gaurdian ports, however it is the easiest to reproduce on thief infiltrator’s arrow, as for all other dodges you kinda need to dodge on the port to get the self immobilise, while with infiltrator’s arrow you can dodge after and selfimmobilise.
Seeing how this is a bug that doesn’t only affect thief there might be some hope it will be addressed a bit sooner then usual, although on the other hand we still have mid-air-immobilise lockdown which is here since beta >_>