Upgrade to SharePoint 2019, seeing ParserServer crashes

We recently upgraded a SharePoint 2013 farm with ~50 content databases to SharePoint 2019.

There are 2 servers in the search topology, each with 24GB of RAM and 8 vCPUs.
A full crawl of all the items (~1.2M) takes a long time (~16 hours), but overall behaves as it previously did. So does the incremental crawl.

But there are relatively a lot of errors and warnings.

Many of the errors involve ParserServer crashing due to SandboxOutOfMemory exceptions.

These occur mainly for msg, ppt and zip file types, here is an example:

NodeRunnerContent1-95572442-185 (0x1CE4) 0x4A54 Search Document Parsing aoe96 High Session: Will retry parsing the document because of the ParserServer crash with ErrorCode=SandboxOutOfMemory, Message=Document failed to be processed. It probably crashed the server. Encoding=System.Text.UTF8Encoding, FormatId=msg, DocId=ssic://79681. Session=36c079ff-b336-4b33-bc00-c15198fb4e20. 3853dafd-9de5-42e9-800f-739da5481b87

While the crawl runs memory is indeed stressed, but not at a 100%.

The CPU does go straight to 100%.

The AV has some suggested exclusions defined, but not all of them.

I fail to see how this would result in only certain file types crashing this process.

Any ideas?