fix: always update group info when a new member joins [WPB-4464] #14829

All 15 tests pass in 7s

15 tests +15 15 ✔️ +15 7s ⏱️ +7s
  1 suites +  1   0 💤 ±  0
  1 files +  1   0 ❌ ±  0

Results for commit d4142de. ± Comparison against earlier commit ca88468.