diff --git a/HISTORY.rst b/HISTORY.rst
index c68e7f6f..f2c17c6d 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -30,6 +30,7 @@ PlatformIO Core 6
   - Do not resolve dependencies from the project "src" folder when the `test_build_src <https://docs.platformio.org/en/latest//projectconf/section_env_test.html#test-build-src>`__ option is not enabled
   - Fixed an issue when a custom `pio test --project-config <https://docs.platformio.org/en/latest/core/userguide/cmd_test.html#cmdoption-pio-test-c>`__ was not handled properly (`issue #4299 <https://github.com/platformio/platformio-core/issues/4299>`_)
 
+* Allowed to ``Import("projenv")`` in a library extra script (`issue #4305 <https://github.com/platformio/platformio-core/issues/4305>`_)
 * Improved a serial port finder for a board with predefined HWIDs
 
 6.0.2 (2022-06-01)
diff --git a/docs b/docs
index a3c98fe6..b3bb4bfe 160000
--- a/docs
+++ b/docs
@@ -1 +1 @@
-Subproject commit a3c98fe6f3cf13738d16b497f0396c7bbe20ae0c
+Subproject commit b3bb4bfe67f98edbf5acfbdbb2cf61d7912dec29
diff --git a/platformio/builder/tools/piolib.py b/platformio/builder/tools/piolib.py
index f868ed2d..3a0072c2 100644
--- a/platformio/builder/tools/piolib.py
+++ b/platformio/builder/tools/piolib.py
@@ -1142,6 +1142,8 @@ def ConfigureProjectLibBuilder(env):
                 _print_deps_tree(lb, level + 1)
 
     project = ProjectAsLibBuilder(env, "$PROJECT_DIR")
+    env.Export(dict(projenv=project.env))
+
     ldf_mode = LibBuilderBase.lib_ldf_mode.fget(project)  # pylint: disable=no-member
 
     click.echo("LDF: Library Dependency Finder -> https://bit.ly/configure-pio-ldf")
diff --git a/platformio/builder/tools/platformio.py b/platformio/builder/tools/platformio.py
index 69875a70..9b2aedb8 100644
--- a/platformio/builder/tools/platformio.py
+++ b/platformio/builder/tools/platformio.py
@@ -23,7 +23,6 @@ from SCons.Node import FS  # pylint: disable=import-error
 from SCons.Script import COMMAND_LINE_TARGETS  # pylint: disable=import-error
 from SCons.Script import AlwaysBuild  # pylint: disable=import-error
 from SCons.Script import DefaultEnvironment  # pylint: disable=import-error
-from SCons.Script import Export  # pylint: disable=import-error
 from SCons.Script import SConscript  # pylint: disable=import-error
 
 from platformio import __version__, fs
@@ -180,8 +179,6 @@ def ProcessProjectDeps(env):
         )
         env.Exit(1)
 
-    Export("projenv")
-
 
 def ParseFlagsExtended(env, flags):  # pylint: disable=too-many-branches
     if not isinstance(flags, list):