getFullNumber not working for country code 972

Hello,

getFullNumber function is always giving only country code for +972.
For example my phone number +972555555555, library says phone number valid. But when I run getFullNumber function it only says 972. I tried with another (real) phone numbers with same country code but results are same only gives country code.

I tried randomly +49, +93, +1, +61 these are working fine.

How can I fix this issue?