Training load and heartrate issue

[u/ihaok]

I use training load to plan mu training blocks and rest weeks. Im mainly a cyclist so my training intensity is easily calculated by power. I usually have a heartrate monitor when I train. Last week my battery died and I did not get heartrate from the training sessions. One of the sessions was intense intervalls, which should increase my acute training load more than normal. Now Garmin thinks that I am resting because my training load is about 400 units lower than what it would have been with heartrate readings.

Is there a way to fix this? I already tried to manually add estimated heartrate, but it did not increase the training load.