[BUG] variable assignment is ignored inside if-chain

[Tirito6626]

variable assignment/modification is ignored inside if-chain and is replaced with true (aka :) command, only if it isn't the last condition:

if {
                arg == "-V" or arg == "--version": show_version()
                arg == "-h" or arg == "--help": show_help()
                arg == "-v" or arg == "--verbose": VERBOSE = true
                arg == "-j" or arg == "--json": USE_JSON = true
                arg == "--suppress-warnings": SHOW_WARNING = false
                else {
                    error("Invalid argument: {arg}")?
                } 
            }

result:

if [ "$(( $([ "_${arg_41}" != "_-V" ]; echo $?) || $([ "_${arg_41}" != "_--version" ]; echo $?) ))" != 0 ]; then
            show_version__37_v0 
        elif [ "$(( $([ "_${arg_41}" != "_-h" ]; echo $?) || $([ "_${arg_41}" != "_--help" ]; echo $?) ))" != 0 ]; then
            show_help__38_v0 
        elif [ "$(( $([ "_${arg_41}" != "_-v" ]; echo $?) || $([ "_${arg_41}" != "_--verbose" ]; echo $?) ))" != 0 ]; then
            :
        elif [ "$(( $([ "_${arg_41}" != "_-j" ]; echo $?) || $([ "_${arg_41}" != "_--json" ]; echo $?) ))" != 0 ]; then
            :
        elif [ "$([ "_${arg_41}" != "_--suppress-warnings" ]; echo $?)" != 0 ]; then
            __SHOW_WARNING_20=0
        else
            error__42_v0 "Invalid argument: ${arg_41}"
            __status=$?
            if [ "${__status}" != 0 ]; then
                exit "${__status}"
            fi
fi