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Presuming the following project example:

project(test LANGUAGES CXX VERSION 2021.05.00)
...
write_basic_package_version_file("${CMAKE_BUILD_IDR}/test-config-version.cmake"
                                 COMPATIBILITY SameMinorVersion)

And the following find_package call:

find_package(test 2021.05)

You would expect that the test-config-version.cmake generated file would correctly match to 2021.05 as it has the same Major and Minor versions. But write_basic_package_version_file encodes the minor version as 05.00 instead of 05 and therefore can't match as the generated file uses exact matching logic.

To demonstrate here is an example test-config-version.cmake and you can see that it doesn't properly determine that a patch version exists on PACKAGE_VERSION and therefore generates a bad regex.

set(PACKAGE_VERSION "2021.05.00")

if(PACKAGE_VERSION VERSION_LESS PACKAGE_FIND_VERSION)
  set(PACKAGE_VERSION_COMPATIBLE FALSE)
else()

  if("2021.05.00" MATCHES "^([0-9]+)\\.([0-9]+)")
    set(CVF_VERSION_MAJOR "${CMAKE_MATCH_1}")
    set(CVF_VERSION_MINOR "${CMAKE_MATCH_2}")
  else()
    set(CVF_VERSION_MAJOR "2021.05.00")
    set(CVF_VERSION_MINOR "")
  endif()

  if(PACKAGE_FIND_VERSION_RANGE)
    ..trimmed
  else()
    if((PACKAGE_FIND_VERSION_MAJOR STREQUAL CVF_VERSION_MAJOR) AND
        (PACKAGE_FIND_VERSION_MINOR STREQUAL CVF_VERSION_MINOR))
      set(PACKAGE_VERSION_COMPATIBLE TRUE)
    else()
      set(PACKAGE_VERSION_COMPATIBLE FALSE)
    endif()

    if(PACKAGE_FIND_VERSION STREQUAL PACKAGE_VERSION)
      set(PACKAGE_VERSION_EXACT TRUE)
    endif()
  endif()
endif()


Tested with CMake 3.20.2