Cannot remove local-address from default PPP profile

RouterOS Scripting
1

Through WinBox, I can remove the local-address option from the default PPP profile just fine.
How can I achieve the same through the terminal?

I can define it without problem:

[admin@VM] /ppp profile> set default local-address=1.2.3.4
[admin@VM] /ppp profile> print where name=default
Flags: * - default
0 * name=“default” local-address=1.2.3.4 use-mpls=default use-compression=default use-vj-compression=default use-encryption=default only-one=default change-tcp-mss=yes

But I cannot remove it:

[admin@VM] /ppp profile> set default local-address=
[admin@VM] /ppp profile> print where name=default
Flags: * - default
0 * name=“default” local-address=1.2.3.4 use-mpls=default use-compression=default use-vj-compression=default use-encryption=default only-one=default change-tcp-mss=yes

[admin@VM] /ppp profile> set default local-address=“”
invalid value for argument address

This is on a RouterOS version 5.26.

2

use unset command