Tile is not rendered when request for glyph fails with a 404

[pathmapper]

mapbox-gl-js version: v1.9.1

browser: Firefox/Chrome, likely any

This has been reported before in #662, but was fixed according to #662 (comment).

Steps to Trigger Behavior

Use a non-existing font as value for the text-font layout property.

Link to Demonstration

Non-existing font resulting in 404 and affected tiles are not rendered

https://jsbin.com/mahoxoduhu/1/edit?html,output

Existing font

https://jsbin.com/vexanaqiju/1/edit?html,output

Expected Behavior

All tiles are rendered (the tiles with missing glyphs without labels).

Actual Behavior

Map is only partially rendered - tiles with labels are not rendered because of failing requests for glyphs (404).

There is no error or warning in the browser console (there is only the 404 in the network tab).