Via [url=https://blog.counter-strike.net/index.php/2019/05/24034/]the CS:GO blog[/url]:

[quote=Valve][MISC]
– Fixed an issue that could cause the blinking light on C4 carried by players to be visible through geometry.
– Fixed a regression in molotov detonation timing.
– Fixed a movement regression when crouching through openings at ground level.
– Fixed a weapon accuracy regression when crouch moving.
– Fixed a small regression in acceleration computation.
– Fixed disconnected players sometimes not showing up on end of match Danger Zone scoreboard.
– Fixed a crash that showed a “CUtlLinkedList overflow” dialog box.
– Fixed floating white boxes that would appear for some players.

[MAPS]
Mirage:
– Fixed shading on stone blocks around A site

Vertigo:
– Updated clipping on wire railings around the map
– Fixed C4 stuck spot near T spawnp[/quote]

Rumor has it:

- The only other thing included is a set of localization file updates which are made possible in part by contributions from [url=https://translation.steampowered.com]Translators Like You - Thank You[/url]: https://github.com/SteamDatabase/GameTracking-CSGO/commit/1b6101344a1197e4f7ae3ee800ce340441c0d572

- Size is ~40 MB