Fail to compressToBase64 in php and decompress in javascript

[freemaths]

Compressing in php with:
\LZCompressor\LZString::compressToBase64("test string");
Compressed data: C4UwzsAEEE4JYDsDmQ==

Fails to decompress in javascript:
LZUTF8.decompress("C4UwzsAEEE4JYDsDmQ==",{inputEncoding:"Base64"})
Decompressed data: ��0��N `;��

Presumably incompatible with latest npm version (using latest lzutf8 v 0.5.5) https://www.npmjs.com/package/lzutf8