Upgrading a skill gem 17-18 (specifically Temporal Chains) crashes the game

Hi, as title.

This has been fine with other gems. I have relogged, changed instances etc, but it happens every time with temp chains.

It also wipes the map portals, and rolls back progress for a few minutes.

Just lost a load of logbooks due to it.

Update: This is also the case with Blasphemy (just attempted). Previous skill gem levels have been no problem, and 17-18 for example Essence Drain, Contagion etc also no issue