Heart rate recovery HRRc

It would be considered an outlier, but it’s certainly not impossible.
Did you get the 198 by historical data or did you use the 220 - age formula?
The form of the curve does not really make sure if it is an artefact or not. Do you have multiple occurrences of similar values?
Here’s a chart from an older study. The straight black line defines the 220 - age.

If you want to read the article that goes with it:

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Seeing that chart, reminds me of this tweet.
https://x.com/StephenSeiler/status/1636277639311663104

My first approches was 220-age but I modified by 198 bcs I saw it sometimes during my training, but If you want I can give you much more information about my HR I have a lot of data since I started to train. By the way, you can Check my ICU or my Suunto account, they are public