"World of Chunk" expressions return null but skript had no errors or warnings.

[TUCAOEVER]

Skript/Server Version

Server Version: git-Paper-722 (MC: 1.16.5)
Skript Version: 2.6-beta2-nightly-dfaa36e

Bug Description

Biome change doesn't work.

Expected Behavior

Biome should be changed as it should.

Steps to Reproduce

command /tx:
	trigger:
		set {_c} to chunk at player's location
		set {_biome} to "plains" parsed as biome
		biomeChangeChunk({_c}, {_biome})
		send "%{_c}%" to console

function biomeChangeChunk(c: chunk, b: biome):
	send "%{_b}%" to console
	set {_pos1} to bottom northwest corner of {_c}
	set {_pos2} to bottom southeast corner of {_c}
	set {_xmin} to x-coordinate of {_pos1}
	set {_zmin} to z-coordinate of {_pos1}
	set {_xmax} to x-coordinate of {_pos2}
	set {_zmax} to z-coordinate of {_pos2}
	set {_x} to {_xmin}
	set {_z} to {_zmin}
	while {_x} <= {_xmax}:
		while {_z} <= {_zmax}:
			set biome at location({_x}, 128, {_z}, world of {_c}) to {_b}
			add 1 to {_z}
			send "%{_x}% %{_y}% %{_z}%" to console
		set {_z} to {_zmin}
		add 1 to {_x}

Codes which used to test listed above.

Errors or Screenshots

Screenshot after entering "/tx" command and rejoining the server.

Other

No response

Agreement

• I have read the guidelines above and confirm I am following them with this report.

[TUCAOEVER]

"world of chunk" return null but skript had no errors or warnings.