As I read your assembly instructions for the WxLink LoRa for WeatherRack information. The DS3231 clock location places it on both the transmit and receiver boards. So before I power it up I want to make sure the clock is placed on the correct board.
The section on Page 4 for the DS3231 Clock mentions it plugged into the TX board at JP10.
On Page 10 at the top is this statement:
First STEP: Plug in the DS3231 Clock on the RX Mini Pro LP Board in the JP 10 socket with the Battery facing the top of the Mini Pro XP Board (as in the picture below). Align the GND pins carefully.
So with the sleep discussion on Page 18 it talks about using the DS3231 but it only references the ProMiniLP board but not the one it should be plugged into. Since this activity is pertaining to the TX board, my assumption would be the Clock is plugged into the TX board.
Also at the beginning of the Assembly Instructions it mentions hooking up the WeatherRack and the AM2315. But there is not any mention of the best plug to use on the TX board for the AM2315. My assumption is the AM2315 can be plugged into one of the I2C plugs on the TX ProMiniLP board.
BTW, the pics on Page 11 are very blurry and don't do well when zooming in on the page.
As an add to using the clock board. I have found that using the clock in the BC24 board with the weather program set up, it doesn't work very well either. In the first part of your BC24 weather manual the clock board is mentioned but there isn't a step discussing how to install the clock IIRC. I found it is hard to set up the internet connection using smart config and the program tends to freeze up as well with the clock board installed. Without it runs like a champ.