The issue applies to Whonix 18 too, at least in a few cases:
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[Build 2025102408-4.3] openQA test fails in TC_20_AudioVM_Pulse_whonix-workstation-18 · Issue #10349 · QubesOS/qubes-issues · GitHub - this is about HVM (not PVH), so not that much important for normal use case
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sometimes DispVM based on whonix-workstations gets OOM on boot (https://openqa.qubes-os.org/tests/157435/file/system_tests-qubes.tests.integ.dispvm_perf.TC_00_DispVMPerf_whonix-workstation-18.test_409.guest-disp5862.log):
[2025-10-25 05:36:26] [ 7.041326] Kernel panic - not syncing: Out of memory: compulsory panic_on_oom is enabled -
the full dispvm test didn’t completed in time at all: Qubes OS openQA: qubesos-4.3-pull-requests-x86_64-Build2025102408-4.3-system_tests_dispvm@64bit test results
I haven’t looked deeper into what uses most memory on Whonix 18, at least not yet.