QuickSave and Autosave freezes/crashes the game (v0.47RC)

I have been testing 0.47 RC that was recently released on the forums. I first loaded OpenMW with mods and had frequent crashes and freezes when I was aggressively quick-saving or when there was an auto-save. I turned off all my mods and managed to replicate the issue running OpenMW Vanilla.

It always happens when there is saving and the last message I see before I kill the process is one of the two following messages.

[23:43:33.230 I] Making a screenshot for saved game 'Quicksave'
[23:52:52.684 I] Making a screenshot for saved game 'Autosave'

(First is a modded game, second vanilla)

So the screen freezes, but the sound keeps playing.

My openmw.log of the vanilla attempt can be found here: https://pastebin.com/XCdPhVHn

( Reading back the log the core of the issue seems to be:

[23:48:12.256 W] Warning: dynamic library '/home/outcast/Downloads/openmw-0.47.0-Linux-64BitRC1/lib/osgPlugins-3.6.5/osgdb_jpeg.so' exists, but an error occurred while trying to open it:
[23:48:12.256 W] libjpeg.so.62: cannot open shared object file: No such file or directory
[23:48:12.256 E] Error: Can't open savegame screenshot, no jpg readerwriter found

)

What is your operating system?

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.2 LTS
Release:	20.04
Codename:	focal

What version of OpenMW are you using? If you used a bleeding edge build, state the exact revision used. v0.47 RC

What version of Morrowind are you using (i.e. retail CD or Steam)? What addons (Tribunal, Bloodmoon) do you have installed? What language is your Morrowind install? Files from Steam in English.

Do you use any mods? If so, does the problem also occur in a clean vanilla install without any mods? Yes, and yes.

What are the exact steps to reproduce the problem? In the Launcher under Advanced -> Misc I have the following settings: [v] Add "Time Played to saves Maximum Quicksaves: 10 Other: PNG

What I did in vanilla was go into open space (although I had the issue in an urban environment too once or twice). Keep W and shift pressed and frequent bash space and occasionally with your spare finger press the (F5) QuickSafe button. At some point it will freeze.