Custom guest names ignored

[nhlpl]

Issue?
Guest names not handled properly.

How to reproduce?
/admin/settings/guest
Enable 'Allow guest handles'
Give permissions for guests to post topics and post replies

Post topic with no given name
NodeBB gives default Guest name
Reply with some custom name and NodeBB ignores it

Post topic with custom name (G123)
Reply to the newly topic with some new name for guest user (ignored and Guest name applied)

What is expected?
Custom guest names applied every time.

Hosted on Alpine Linux edge using Podman v3.0.1
NodeBB v1.17.0-beta.3 is run with Node.js v14.16.0
NodeBB SHA:6e8b1bb9ad9301258b0b061705450255532a78ee
Built with Nobbic v0.5.0
It uses:

• nginx (docker.io/nginx:alpine)
  with NGINX_VERSION=1.19.8 NJS_VERSION=0.5.2
• nodebb (localhost/nodebb:14.16.0-1.17.0-beta.3)
  with NODEBB_VERSION=1.17.0-beta.3 NODE_VERSION=14.16.0 YARN_VERSION=1.22.5
• redis (docker.io/redis:6.2.1-alpine)
  with REDIS_VERSION=6.2.1