Issue description
I found copy-pasting conveyor with connectors will produce more connectors when surrounded by inputs.

Expected behavior
Copy paste should be as is, no additional connectors should appear.
Reproduction steps
- Build the conveyor: results vary depending on how the conveyor was built, conveyor on the top was built by copy pasting the connectors manually then connecting them, conveyor on the bottom was built by connecting the inputs connector is automatically built, issue only happens for the right side.
- Copy paste the right side (including buildings)
- More conveyors appear.

Here are the blueprints:
Normal one, top right in the image
B368:H4sIAAAAAAAACmWP3UrDQBCFZ+Nm00TbSMV7n6D40xcQqRKwNmCvvAnbZltHtjthsxXyqiLiA4hvUHAbqYjezXycc+YMY9HpYDg4G86KQNyRXUm9BxHnhxOLSzRSj4xD12TlyyYN+7e0xNrhvM5MtXZjKhWIox84WbsdjdIbZZSVOrdI1gf0gXXi3JIj11QqPr6sa7Wa6Wak1dxZXKAqp+fAknhqpakXvkiYAAjg/NUf9kPUJnhFCN/87S9PeiAY5+//9Fse8I9N2rL9kzEafMCqyCgn6+4fZaWKay3dFZln1ZBtw4Q/E/DPnakN2jLw20Hvt3x6Aayb+N5P/hWyTTfwGm/uCAgEfAFcRc1VYQEAAA==
Abnormal one, bottom left in the image
B368:H4sIAAAAAAAACmWO3UrDQBCFZ+PmV9tIxXufoPjTFyhSJWBpwVx5EzbNto5sd8NmK+QFxMcSL8SHUnAaqYjCXMx8nDnnMBaeDkfDs1FZeNG41MauhdqDkPPDmcUVaqEm2qFrs+rlI/UHN2aFjcNFk+l646amkhAc/cDZxu1omF5LLa1Qc4vGksEAWBTPrXHGtbWMj8dNI9elaidKLpzFJcoqPweWxLkVullSET8BCIDzVwqmJewcSOHDN3/7y5M+BIzz93/6LQe69vtXSrhLox9la2x+AewgobgHamBs2/NIA+BFAXg0/Okz7Tx6J1PUeId1kZm5se72XtSy+O3UhQdUy+PPu6cueMu+ANm/oDRjAQAA
Game version
0.4.14b
Attachments
Duplicating Connector.save
Files not imported: Duplicating Connector.save