Thanks for sharing your data, can you also post csv from second leg.
How did you fix Moxy on your leg? Did you use tape or just placed under the bibs? There seems to be a lot of noise in last 2 intervals, I tend to see similar noise when Moxy is not properly fixed in place on the leg just sitting under the bibs.
In the case when you have 2 Moxy sensors to your disposal, best place to use them is on working and non-working muscle. Non-working muscle for cyclists: deltoid, will allow you to observe your body systemic reactions.
Having 2 Moxy on left and right VL would be next step to identify potential leg imbalance if any.
By looking at your SmO2 we can see it starts at quite low level and drops further down single digit number.
What is quite interesting: last 2 intervals right in the middle SmO2 suddenly increases, this could indicate change in pedaling technique and engagement of other muscles to compensate, or could be caused by noisy data, but it is something worth of further investigation.
I would suggest performing another test, with Moxy on VL and deltoid, fixed properly with Cover-Roll stretch tape. This time add 3-4 min “calibration interval” before and after the assessment while you are not doing any work, just seating on the bike. Also your load steps seem to start a bit high. Try using 44%, 66%, 88%, 110, 132% of FTP it might give you much better picture. If possible make it 5-1-5 instead of 4 min, in some cases 4 min might not be enough. Also if you need to drink/use towel/move/ change position, do it only in first minute of each step load. During rest do not seat back, but be in the same position as during load step.