Mainline kernel had this issue - but it was resolved by patch:
https://github.com/torvalds/linux/commit/8b4bd256674720709a9d858a219fcac6f2f253b5#diff-fa93c4ecc9ca98e9a9a7895c81c1965a1732bc6928e2edf74734a5638215f794
Can you apply that patch for Ubuntu kernels 5.4.0-x?
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dmesg for kernel 5.4.0-84-generic
** Attachment added: "dmesg84"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1943103/+attachment/5526006/+files/dmesg84
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dmesg for kernel 5.4.0-81-generic
** Attachment added: "dmesg81"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1943103/+attachment/5526007/+files/dmesg81
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I can confirm overheating on HP ZBook 17 G6/860C, BIOS R92 Ver. 01.05.04
06/03/2020 with Ubuntu 5.4.0-84.94-generic kernel.
The problem occurs because of commit:
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thermal/drivers/int340x/processor_thermal: Fix tcc setting
BugLink: https://bugs.launchpad.net/bugs/1938713
commit fe6a6de6692e7f71
