What gapps you're using?It is trial and error. There are more not working uaually end up in boot loader or boot loop mode. So far my known list of working gsi are:
1) Havoc (Braialindo)
2) Cherish (Braialindo) - Only if dirty flashed over Havoc
3) Crdroid R Mod (eremitein)
4) Caos (eremitein)
Version : arm64-bgz; arm64-bvz; arm64-ab-gapps; similar but vanilla version
Please share if you have additional.
Have you tried bitgapps?