Horizon UAG via zscaler browser access - freeze up issue

Hi,
we are testing remote PC access via Horizon UAG (Unified Access Gateway) through zscaler browser based/html access.
Everything works as expected all the way through to a remote PC, but shortly after logging into it, the screen freezes and keyboard/mouse doesn’t work.
Meanwhile, if we bypass zscaler browser access by connecting from an on-prem workstation to UAG - the session is stable with no freeze-ups.
Are there any best practices to configure Horizon UAG with zscaler browser based access and is this a known issue?