Bug? Freezing Arbor Tree Branches

The screenshot does not show the trees body temperature. Could you hover over the red text in Requirements please? Maybe the liquid is uninsulated and heats up the farm tile?

Here are the temps for all related locations to the tree that was highlighted above:

Hydroponic farm tile - 18.8 C
Tree body temperature - 17.6 C
Liquid pipe (granite) - 19 C (contains 9.9 kg of PW at 20.2 C)
Tiles (sedimentary rock) on either side of hydroponic tile - 18 C (left)/18.4 C (right)
Tree branch temperatures:

                                  10 C

               10.1 C                       10.1 C

               10.1 C                       10.1 C

               12.8 C                       13 C

Ambient temperatures around tree:

                                15.4 C

               15.6 C        16 C       16.3 C

               15.6 C        16 C       16 C

               17.5 C        17.8 C    17.9 C

Does this still occur when you remove the overlapping trees? I think the "body temperature" is sometimes shown in my save as a problem when the real problem is something else.

No, it doesn't. I've used this approach for over a year now to grow my arbor trees.

So removing overlaps fixed it? Or what do you mean "no it doesn't"?

Sorry for the confusion. I haven't tried removing the overlaps. In fact, after only a couple more turns, the temperature "magically" jumped 10 degrees for the branches...without anything being done.

I have noted that some buildings are now also slow with temperature updates some times. A desalinator took about 300 seconds to update its output temperature. After that it was faster, but there still were delays. May be an effect from the efforts to optimize performance. Some updates may get stuck in a queue far longer than they should.