Strand works plugged into wall but not plugged into other strands

I have an incandescent pre-lit tree with multiple plugs within the tree that daisy-chain together. When each strand is plugged in individually to the wall, everything works; but when I plug them together there is one strand in the middle of the tree that does not work. I’ve used the Light Keeper Pro tool to check the voltage in the strand and it seems to check out throughout the whole stand even when the lights aren’t working. It doesn’t seem like this is an issue with the male portion of the plug since it works fine when plugged in elsewhere. Maybe there’s something wrong with the female portion that it’s getting plugged into? The strand on the other end of that plug works fine. None of the trouble-shooting lists seem to cover this.

Thank you!