If I use the /playsound command to try and stack sounds, it will only play one sound and not both

I haven't tested this locally, but it definitely happens on Realms.

Steps to Reproduce:
1. Create a function with multiple playsounds that happen at the same time.
2. Put the function to run in a command block.
3. Run the command block.
Observed Results:
Whatever the last /playsound command than is called is the only sound that plays.
Expected Results:
Play all sounds at the same time if they are called at the same time.