SSD forgetting SMART selftest log history

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I ran some short and long selftests on a WD blue SSD. I could see the test results as expected immediately after completion. Some weeks later I checked the smart status again. No test (with success or fail outcome) was logged on the SSD.

The last and only SMART selftest result was logged many months back at age 0 hours. Result of all SMART tests run after that (at least 10 tests) are not to be found. Is the SSD going going gone? I haven't seen read errors in syslog but 3-4 times after a power cycle the SSD came up with an empty partition table and unable to run SMART commands. Another power cycle fixed it (for the time being). Most of these were after unplanned short power cuts.

Anyone else face this or something similar?

PS: I just ran selftest again, and the log shows this disturbing contradiction:

9 Power_On_Hours          0x0032   100   100   ---    Old_age   Always       -       5356
Num  Test_Description    Status       Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended offline    Completed without error       00%         0         -

Note the lifetime is 5356 (hours) but the test I just ran is logged at lifetime 0. I suspect the next power cycle will wipe out this selftest memory.