It is a bug. Kirito's didn't dispel her suspicion because her affection didn't go back up. This is her stats at the end of v0.45. Notice the date of Last sexual experience. Also "Special Coffee" is not listed as her Favorite Foods in v0.50. Starting a new game probably messed up the stats page.
View attachment 3886108
I would have been disappointed if Kirito's affection reset again. His affection already reset once before and if it happened again I would stop taking any future changes to Kirito's affection seriously anymore.
Regarding Asuna's affinity towards Kirito, I inquired Fujino about it through a private message.
Fujino said: Asuna's two-time recovery(not reset) of her affinity towards Kirito was intentional. The "coffee" bug that did not display the correct value was a bug, and Fujino appreciates your feedback.
And here is my personal opinion:
Emotions are unstable, especially for women. Asuna's affinity towards Inoda and Kirito has been dynamically changing.
In the recent few versions, due to Inoda's clumsy actions, Asuna's affinity towards him has been gradually decreasing.
Her first decrease in affinity towards Kirito was due to a misunderstanding, thinking he was timid in the face of Kyoko's pressure. But later, when she found out Kirito was just trying to gain Kyoko's trust through actions rather than words, her affinity towards him was completely restored.
This time, Asuna mistakenly thought Kirito was playing the game with another woman and hiding it from her. For this suspected infidelity, the affinity decrease was only 20, because Asuna is a forgiving woman who would tolerate Kirito's infidelity to a certain extent, just as she is tolerant towards Inoda. Additionally, she is doing the same thing herself, and her double standards are not that severe at the moment.
After the conversation between Asuna and Kirito at the apartment door, the misunderstanding of Kirito's infidelity was temporarily resolved, so her affinity has largely recovered. But Asuna still has a lingering concern about this issue, so it has not been completely restored, leaving a crack. It's also a setup for future episodes.
Overall, I think Fujino's plot arrangement is logically coherent, and I am personally quite satisfied with it. Whether it is sufficient to convince everyone is up to individual perspectives.