Keep in mind that in order to really evaluate your fitness and structure your training, you need to do both efforts with the prescribed recovery interval in between. You can get some really valuable information by comparing the data from the first interval to the data from the second, and also by looking at how well you were able to recover in between. Like despite going all out max in both efforts, if there is a big drop off from your first effort to your second, it may indicate that you haven't put enough training time into building your aerobic base, and you can structure your training accordingly. If your heart rate is consistent in both efforts but your power/output drops off, it can indicate that your aerobic base is good enough, but that you can benefit from lactic threshold training so that you can sustain your power output longer at that heart rate and exertion level. You can structure your training to do more to develop your ability to sustain those harder efforts longer into your rides, with good results.
Just make sure that you are riding full out efforts both times. If you aren't, you aren't doing your field test properly. If you do, you may not like the results, but they can tell you quite a bit about how to structure your training in order to make progress. Properly done, what you are looking for are good fairly consistent efforts from both intervals, with good heart rate and physiological recovery in between. When you see that, then you are in a good position to use the heart rate or power data to structure your training for your given period of the season and going forward. Down the road, like in about 8 to 12 weeks, you can do another and evaluate your progress. If you prepare and conduct the field tests consistently, you can use a comparison of the results to tell you a lot about who well you are structuring your training.
Hope this helps.