LicenseRef-Case-Sensitive and LicenseRef-case-sensitive not recognized as the same identifier

[vargenau]

case-sensitive2.spdx.txt

File is valid SPDX, but tools-python says:

mvargena@M-FVFL11531WG7 252 > pyspdxtools -i case-sensitive2.spdx
ERROR:root:The document is invalid. The following issues have been found:
Unrecognized license reference: LicenseRef-case-sensitive. license_expression must only use IDs from the license list or extracted licensing info, but is: LicenseRef-case-sensitive

Tools Java 1.1.8 correctly says the file is valid SPDX.