groovysh easily breaks

If an incorrect command is entered the REPL stops working:

Groovy Shell (4.0.26, JVM: 1.8.0_432)
Type ':help' or ':h' for help.--------------------------------------------------------------------------------------------------------

groovy:000> System.getProperty("java.version")
===> 1.8.0_432
groovy:000> println "Hello"
Hello===> null

groovy:000> a=[
groovy:001> println "Hello"

groovy:002> System.getProperty("java.version")
groovy:003> a=[:]
groovy:004>

After 'a=[' other than commands (:command syntax), the REPL seens to break requiring a restart, which is frustrating and time consuming to say the least.

Am I missing something?

Thanks.

Linux kiwi 6.1.0-34-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.135-1 (2025-04-25) x86_64 GNU/Linux