apply proposed fix of foundry-rs/foundry#9263 - works!

foundry.toml

@@ -6,25 +6,25 @@ libs = ["lib"]
 # Diff: https://www.diffchecker.com/XpsJPeq8/
 
 # Works: manual remapping
-remappings = [
-    # Same
-    "create2-helpers/=lib/seadrop/lib/create2-helpers/",
-    "create2-scripts/=lib/seadrop/lib/create2-helpers/script/",
-    "ds-test/=lib/seadrop/lib/ds-test/src/",
-    "ERC721A-Upgradeable/=lib/seadrop/lib/ERC721A-Upgradeable/contracts/",
-    "ERC721A/=lib/seadrop/lib/ERC721A/contracts/",
-    "forge-std/=lib/forge-std/src/",
-    "murky/=lib/seadrop/lib/murky/src/",
-    "operator-filter-registry/=lib/seadrop/lib/operator-filter-registry/src/",
-    "seadrop/=lib/seadrop/",
-    "solmate/=lib/seadrop/lib/solmate/src/",
+# remappings = [
+#     # Same
+#     "create2-helpers/=lib/seadrop/lib/create2-helpers/",
+#     "create2-scripts/=lib/seadrop/lib/create2-helpers/script/",
+#     "ds-test/=lib/seadrop/lib/ds-test/src/",
+#     "ERC721A-Upgradeable/=lib/seadrop/lib/ERC721A-Upgradeable/contracts/",
+#     "ERC721A/=lib/seadrop/lib/ERC721A/contracts/",
+#     "forge-std/=lib/forge-std/src/",
+#     "murky/=lib/seadrop/lib/murky/src/",
+#     "operator-filter-registry/=lib/seadrop/lib/operator-filter-registry/src/",
+#     "seadrop/=lib/seadrop/",
+#     "solmate/=lib/seadrop/lib/solmate/src/",
 
-    # Different
-    "openzeppelin-contracts-upgradeable/=lib/seadrop/lib/openzeppelin-contracts-upgradeable/contracts/",
-    "openzeppelin-contracts/=lib/seadrop/lib/openzeppelin-contracts/contracts/",
-    "openzeppelin/=lib/seadrop/lib/openzeppelin-contracts/contracts/",
-    "utility-contracts/=lib/seadrop/lib/utility-contracts/src/",
-]
+#     # Different
+#     "openzeppelin-contracts-upgradeable/=lib/seadrop/lib/openzeppelin-contracts-upgradeable/contracts/",
+#     "openzeppelin-contracts/=lib/seadrop/lib/openzeppelin-contracts/contracts/",
+#     "openzeppelin/=lib/seadrop/lib/openzeppelin-contracts/contracts/",
+#     "utility-contracts/=lib/seadrop/lib/utility-contracts/src/",
+# ]
 
 # Does not work: automatic remapping
 # remappings = [

src/Counter.sol

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: UNLICENSED
 pragma solidity ^0.8.13;
 
-import {ERC721SeaDrop} from "seadrop/src/ERC721SeaDrop.sol";
+import {ERC721SeaDrop} from "seadrop/ERC721SeaDrop.sol";
 
 contract Counter is ERC721SeaDrop {
     uint256 public number;