Describe the issue:
Sync fails with "out of memory" error, even though task manager on RPI shows sync was only using half of available RAM.

What behavior did you expect? To sync the Liquid Chain successfully.

To reproduce issue: Run elementsd

What version of Bitcoin Core are you using, where did you get it (website, self-compiled, etc)? Bitcoin Core v22.0.0, from Bitcoin Core website

What type of machine are you observing the error on (OS/CPU and disk type)? RPI4, 8GB Ram, 128 GB SD

GUI-related issue? What is your operating system and its version? If Linux, what is your desktop environment and graphical shell? Raspian

Any extra information that might be useful in the debugging process:

bitcoin.conf settings
server=1
daemon=1
rpcuser=....my user
rpcpassword=...my password
datadir=/home/usr/.bitcoin
prune=1000
dbcache=100
maxmempool=200
maxconnections=30
par=1

elements.conf settings
mainchainrpcuser=....my user
mainchainrpcpassword=...my password
mainchaindatadir=/home/usr/.bitcoin
prune=1000
dbcache=100
maxmempool=200
maxconnections=30
par=1
chain=liquidv1