Boot fails for ext4 filesystems with certain features enabled

[Thomas Kurz]

Dear team,

I observe that GRUB 2.04 fails to boot an ext4 filesystem which has one of the 
following features enabled:

large_dir
metadata_csum_seed
casefold

My configuration is Arch linux, kernel 5.2, GRUB 2.04, ext2fsprogs 1.45.3

Steps to reproduce: install Arch from current 2019.08.01 release ISO; create 
new ext4 filesystem; enable one of the ext4 fs features mentioned (use common 
fs for both root and boot); configure grub to boot from this filesystem

Result:

error: unknown filesystem
Entering rescue mode...

PS: I would have used the bugtracker, but was unsure about how to fill the 
required fields. Especially "release" doesn't offer 2.04, but only 2.02.

Kind regards,
Thomas