I can confirm this crash

I see in the log file the following:

[2021-05-25T10:08:46.061 MDT INFO ][           org.kde.kstars.ekos] - Ekos received a new device:  "ZWO CCD ASI533MC Pro"
[2021-05-25T10:08:46.525 MDT INFO ][           org.kde.kstars.indi] - ZWO CCD ASI533MC Pro :  "[INFO] Setting intital bandwidth to AUTO on connection. "
[2021-05-25T10:08:46.533 MDT INFO ][           org.kde.kstars.indi] - ZWO CCD ASI533MC Pro :  "[INFO] CCD is online. Retrieving basic data. "
[2021-05-25T10:08:46.595 MDT INFO ][           org.kde.kstars.ekos] - "ZWO CCD ASI533MC Pro is online."
[2021-05-25T10:08:46.605 MDT CRIT ][           org.kde.kstars.indi] - INDI driver  "indi_asi_ccd"  crashed!
[2021-05-25T10:08:46.697 MDT INFO ][     org.kde.kstars.ekos.align] - "Warning! The calculated field of view is out of bounds. Ensure the telescope focal length and camera pixel size are correct."
[2021-05-25T10:08:46.697 MDT INFO ][     org.kde.kstars.ekos.align] - "Warning! The calculated field of view is out of bounds. Ensure the telescope focal length and camera pixel size are correct."
[2021-05-25T10:08:46.793 MDT INFO ][     org.kde.kstars.ekos.align] - "World Coordinate System (WCS) is enabled. CCD rotation must be set either manually in the CCD driver or by solving an image before proceeding to capture any further images, otherwise the WCS information may be invalid."
[2021-05-25T10:08:46.831 MDT INFO ][           org.kde.kstars.ekos] - "ZWO CCD ASI533MC Pro is offline."
[2021-05-25T10:08:46.897 MDT INFO ][     org.kde.kstars.ekos.guide] - "Reconnecting to PHD2 Host: localhost, on port 4400. . ."

Nothing has changed so telescope focal length is correct and pixel size should be correct unless it is getting mangle somewhere else.
 

Rebuilt indi-core and indi-3rdparty installed and it no longer crashes -- Thanks.

Same here, after sync and rebuild the three repos it's working as expected. At least for cooling. I've tried with a ramp of 5 d/C and it has been controlling the temperature:

2021-05-26T13:11:41: [INFO] Setting temperature to 0.00 C.
2021-05-26T13:10:36: [INFO] Setting temperature to 4.30 C. 
2021-05-26T13:09:31: [INFO] Setting temperature to 8.70 C. 
2021-05-26T13:08:26: [INFO] Setting temperature to 12.80 C. 
2021-05-26T13:07:26: [INFO] Setting temperature to 15.10 C. 

So far so good. The problem arises when you turn off the cooling. The ramp is not used, the camera switches off the cooling power completly and start to warmup inertially... then around 1 minute on the process, the ramp code kick off again and sets the current temperature minus the slope and turn on the cooler, so here we go down again 

Regards

I think his behavior varies by driver. Which driver are you using?

I'm using the ASI driver (The camera is an ASI533MC). Right now I can cool down to the desired temperature and at the end of the session warmup until a temperature high enough before switching off.

But after reading the comments from the manufacturer I start to believe that this issue about the "thermal shock" is mainly an urban legend.