Counter-Strike: Source does not launch

[AsciiWolf]

Game information
Counter-Strike: Source (native)

Distribution name and version where applicable
Fedora 40

Flatpak info
Flatpak 1.15.10
default
host

Problem description
Counter-Strike: Source crashes on startup with an "Attempt to free invalid pointer" error. This can be worked around by adding LD_PRELOAD=/app/lib32/libtcmalloc_minimal.so to the game launch parameters.

It is possible that the following blocklist entry needs an update: https://github.com/flathub/com.valvesoftware.Steam/blob/master/resources/blocklist/counter_strike_source.yml#L8

Related ticket: #1158
Related PR: #1171

/cc @doraskayo

Does this issue reproduce with native Steam
Not tested.