Memory leak with Ubuntu 20.04 LTS

[htr3n]

There is no problem with i3lock-fancy-rapid in Ubuntu 18 LTS but in 20.04 LTS, got this error after unlocking the screen.

$ i3lock-fancy-rapid 5 3
...
~/build/i3lock-fancy-rapid master
=================================================================
==42054==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 4864 byte(s) in 19 object(s) allocated from:
    #0 0x7f4fd4be2bc8 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0x10dbc8)
    #1 0x7f4fd3e572f4  (/usr/lib/x86_64-linux-gnu/libfontconfig.so.1+0x212f4)

Indirect leak of 1184 byte(s) in 37 object(s) allocated from:
    #0 0x7f4fd4be2dc6 in calloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0x10ddc6)
    #1 0x7f4fd3e5793c  (/usr/lib/x86_64-linux-gnu/libfontconfig.so.1+0x2193c)

Indirect leak of 341 byte(s) in 34 object(s) allocated from:
    #0 0x7f4fd4b6b3dd in strdup (/usr/lib/x86_64-linux-gnu/libasan.so.5+0x963dd)
    #1 0x7f4fd3e56b64 in FcValueSave (/usr/lib/x86_64-linux-gnu/libfontconfig.so.1+0x20b64)

SUMMARY: AddressSanitizer: 6389 byte(s) leaked in 90 allocation(s).

I built i3lock-fancy-rapid from source pulled from Github master.

Edited: Before i3lock-fancy-rapid worked with i3 normally but it's no longer working after upgrading to Ubuntu 20.04. Executed i3lock-fancy-rapid from command line like above, I got the error.

[htr3n]

Similar to this one: Raymo111/i3lock-color#88

[htr3n]

Related to this bug: i3/i3lock#167

[Animeshz]

Seems like upstream has fixed it, is it fixed?